Andy Trowbridge / Swamp harrier (Circus approximans) feeding on rabbit prey (Oryctolagus cuniculus). Lake Ellesmere, Canterbury, New Zealand. April.

Andy Trowbridge / Swamp harrier (Circus approximans) perched on rabbit prey (Oryctolagus cuniculus). Lake Ellesmere, Canterbury, New Zealand. April.

Andy Trowbridge / Swamp harrier (Circus approximans) perched on prey. Lake Ellesmere, Canterbury, New Zealand. August.

Andy Trowbridge / Swamp harrier (Circus approximans) perched on prey. Lake Ellesmere, Canterbury, New Zealand. August.

Alan Murphy/ BIA / Northern Caracara (Caracara cheriway) with Cottontail Rabbit (Sylvilagus aquaticus) prey, Texas

Brent Stephenson / Juvenile Swamp harrier (Circus approximans) flying against a blue sky. Westshore Lagoons, Hawkes Bay, New Zealand, September.

Brent Stephenson / Adult male Swamp harrier (Circus approximans) flying against a blue sky. Waikanae Estuary, Wellington, New Zealand, August.

Andy Trowbridge / Australasian Harrier / Harrier hawk / Swamp Harrier (Circus approximans) portrait. Banks Peninsula, Canterbury, South Island, New Zealand.

George Sanker / Red-shouldered hawk (Buteo lineatus) perched portrait, National Audubon Corkscrew Swamp Sanctuary, Florida, USA, April

Steven David Miller / Red-shouldered hawk {Buteo lineatus} Pale Florida form, Corkscrew swamp, Florida, USA

Andy Trowbridge / Swamp harrier (Circus approximans) mantling over prey, with wings spread, Lake Ellesmere, Canterbury, New Zealand.

Andy Trowbridge / Two Swamp harriers (Circus approximans) fighting over prey, Lake Ellesmere, Canterbury, New Zealand.